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<?php declare(strict_types=1); |
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/** |
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* This file is part of the daikon-cqrs/config project. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Daikon\Config; |
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use Daikon\Interop\Assertion; |
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final class ConfigProvider implements ConfigProviderInterface |
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{ |
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private const INTERPOLATION_PATTERN = '/(\$\{(.*?)\})/'; |
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private array $config; |
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private ConfigProviderParamsInterface $params; |
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private array $paramInterpolations; |
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public function __construct(ConfigProviderParamsInterface $params) |
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{ |
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$this->params = $params; |
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$this->config = []; |
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$this->paramInterpolations = []; |
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} |
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public function get(string $path, $default = null) |
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{ |
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$path = ConfigPath::fromString($path); |
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$scope = $path->getScope(); |
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Assertion::keyNotExists( |
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$this->paramInterpolations, |
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$scope, |
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"Recursive interpolations are not allowed when interpolating 'locations' or 'sources'. ". |
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"Trying to recurse into scope '$scope'" |
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); |
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if (!isset($this->config[$scope]) && $this->params->hasScope($scope)) { |
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$this->config[$scope] = $this->loadScope($scope); |
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} elseif (!isset($this->config[$scope])) { |
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return $default; |
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} |
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return $this->evaluatePath( |
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$path->getParts(), |
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$this->config[$path->getScope()], |
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$path->getSeparator() |
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) ?? $default; |
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} |
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public function has(string $path): bool |
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{ |
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return $this->get($path) !== null; |
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} |
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public function __invoke(string $path, $default = null) |
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{ |
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$value = $this->get($path, $default); |
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Assertion::allNotNull([$value, $default], "Missing required config value at path '$path'"); |
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return $value; |
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} |
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private function loadScope(string $scope): array |
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{ |
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$this->paramInterpolations[$scope] = true; |
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$locations = $this->params->getLocations($scope); |
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$sources = $this->params->getSources($scope); |
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$loader = $this->params->getLoader($scope); |
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if (!$loader instanceof ArrayConfigLoader) { |
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$sources = $this->interpolateConfigValues($sources); |
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} |
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$locations = $this->interpolateConfigValues($locations); |
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unset($this->paramInterpolations[$scope]); |
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$this->config[$scope] = $loader->load($locations, $sources); |
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return $this->interpolateConfigValues($this->config[$scope]); |
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} |
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/** @return mixed */ |
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private function evaluatePath(array $parts, array $values, string $separator) |
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{ |
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if (empty($values)) { |
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return null; |
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} |
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$pos = 0; |
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$length = count($parts); |
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$value = &$values; |
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while (!empty($parts)) { |
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$pos++; |
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$part = array_shift($parts); |
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Assertion::isArray( |
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$value, |
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sprintf("Trying to traverse non-array value with path part '%s'", join($separator, $parts)) |
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); |
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if ($part === ConfigPathInterface::WILDCARD_TOKEN) { |
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return $this->expandWildcard($parts, $value, $separator); |
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} elseif (!isset($value[$part]) && $pos === $length) { |
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return null; |
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} elseif (!isset($value[$part])) { |
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array_unshift($parts, $part.$separator.array_shift($parts)); |
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continue; |
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} |
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$value = &$value[$part]; |
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} |
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return $value; |
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} |
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private function expandWildcard(array $parts, array $context, string $separator): array |
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{ |
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return array_merge(...array_reduce( |
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$context, |
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function (array $collected, array $ctx) use ($parts, $separator): array { |
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$expandedValue = $this->evaluatePath($parts, $ctx, $separator); |
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if (!is_null($expandedValue)) { |
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$collected[] = (array)$expandedValue; |
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} |
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return $collected; |
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}, |
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[] |
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)); |
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} |
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private function interpolateConfigValues(array $config): array |
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{ |
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return array_map([$this, 'mapInterpolation'], $config); |
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} |
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/** |
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* @param mixed $value |
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* @return mixed |
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*/ |
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private function mapInterpolation($value) |
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{ |
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if (is_array($value)) { |
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return $this->interpolateConfigValues($value); |
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} elseif (is_string($value) && preg_match_all(self::INTERPOLATION_PATTERN, $value, $matches)) { |
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return $this->interpolateConfigValue($value, $matches[0], $matches[2]); |
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} |
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return $value; |
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} |
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/** @return mixed */ |
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private function interpolateConfigValue(string $value, array $valueParts, array $interpolations) |
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{ |
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$interpolatedValues = array_map([$this, 'get'], $interpolations); |
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return array_filter($interpolatedValues, 'is_string') === $interpolatedValues |
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? str_replace($valueParts, $interpolatedValues, $value) |
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: $interpolatedValues[0]; |
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} |
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} |
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daikon-cqrs /
config
